Ge, Shaofeng
Liu, Xuefeng
Qiao, Xiaofen
Wang, Qinsheng
Xu, Zhen
Qiu, Jun
Tan, Ping-Heng
Zhao, Jimin
Sun, Dong
Article History
Received: 2 June 2014
Accepted: 24 June 2014
First Online: 17 July 2014
Competing interests
: The authors declare no competing financial interests.